CN219554821U

CN219554821U - Power supply circuit and intelligent home system

Info

Publication number: CN219554821U
Application number: CN202320371247.9U
Authority: CN
Inventors: 梁伟波; 贺龙胜; 路虎
Original assignee: Shenzhen Oribo Technology Co Ltd
Current assignee: Shenzhen Oribo Technology Co Ltd
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-08-18
Anticipated expiration: 2033-02-21

Abstract

The application provides a power supply circuit and an intelligent home system. The shunt circuit is used for being conducted when the voltage across the first current load is 0; opening when the voltage across the first current load is not 0; when detecting zero crossing points of voltages at two ends of the first current load, conducting according to preset time length; the single fire switch circuit is also used for detecting the zero crossing point of the power supply voltage, and when the starting control signal is received and the zero crossing point of the power supply voltage is detected, the passage between the input end and the first output end is disconnected according to the preset time length, and the passage between the input end and the second output end is connected. According to the application, the first current load is short-circuited through the shunt circuit, so that when the single-fire switch circuit provides larger current for the second current load, the circuit in the loop passes through the shunt circuit, and the working state of the first current load is prevented from being influenced.

Description

Power supply circuit and intelligent home system

Technical Field

The application relates to the field of power supply of intelligent home systems, in particular to a power supply circuit and an intelligent home system.

Background

The traditional single-fire technology is divided into a lamp turning-off circuit and a lamp turning-on circuit. No matter when the lamp is turned off or turned on, only a small current can be taken in order to ensure that the lamp cannot be lightened by taking electricity. Therefore, most of the traditional single-fire technology, namely the single-fire technology for taking small current, adopts an IC scheme such as resistance-capacitance voltage reduction or some low-power-consumption AC-DC when the lamp is turned off. Because the intelligent module of the product needs real-time power supply networking, a low-power-consumption power supply system is used for supplying power to the intelligent module when the lamp is turned off. The low power consumption power supply system can be a buck power supply scheme such as a resistance-capacitance buck, a discrete component buck circuit, an AC-DC IC scheme and the like. Because the intelligent modules in the intelligent switch need to be powered and networked in real time, very little current exists in the circuit loop. When the load is an LED lamp, because the capacitive device is present in the power supply circuit of the LED lamp, small current in the loop can charge the capacitive device of the LED lamp. When the charging voltage is greater than the starting voltage value of the LED, there will be a weak light or flicker, which is more pronounced for low power LED lamps. When the lamp is turned on, the traditional single-firing lamp-on power-taking circuit mainly uses a silicon controlled rectifier or relay scheme to take power, and the problem exists in the simple silicon controlled rectifier power-taking scheme or the relay scheme: when the load is a lamp with small power, the current of the lamp in normal work is not very large, which indirectly leads to the current of single-fire power taking in the process of turning on the lamp.

As analyzed above, conventional single fire techniques, either when off or on, cannot provide high current power, but can only be used in some low power intelligent product scenarios. The demand of large-current intelligent products cannot be satisfied.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a power supply circuit and an intelligent home system, and larger current power supply is realized.

The utility model provides a power supply circuit which is applied to an intelligent home system, wherein the intelligent home system comprises a first current load and a second current load, and the load current of the second current load is larger than that of the first current load; the power supply circuit includes:

a shunt circuit for connection in parallel with the first current load; the shunt circuit is used for being conducted when the voltage across the first current load is 0; disconnecting when the voltage across the first current load is not 0;

the shunt circuit is also used for detecting zero crossing points of voltages at two ends of the first current load, and is conducted according to preset time length when the zero crossing points of the voltages at two ends of the first current load are detected;

the single fire switch circuit is provided with an input end, a first output end and a second output end; the input end of the single fire switch circuit is used for being connected with a power supply voltage, the first output end of the single fire switch circuit is used for being electrically connected with the first current load, and the second output end of the single fire switch circuit is used for being electrically connected with the second current load;

The single fire switch circuit is used for switching on a passage between the input end and the first output end and switching off a passage between the input end and the second output end when receiving an opening control signal; opening a path between the input terminal and the first output terminal and closing a path between the input terminal and the second output terminal upon receipt of a closing control signal;

the single fire switch circuit is also used for detecting the zero crossing point of the power supply voltage, and when the starting control signal is received and the zero crossing point of the power supply voltage is detected, the passage between the input end and the first output end is disconnected according to the preset duration, and the passage between the input end and the second output end is connected.

In one embodiment, the shunt circuit comprises:

a shunt switch circuit for connecting in parallel with the first current load;

a voltage detection circuit for connection in parallel with the first current load; the voltage detection circuit is used for detecting voltages at two ends of the first current load;

a first zero-crossing detection circuit connected in parallel with the voltage detection circuit; the first zero-crossing detection circuit is used for detecting zero crossing points of voltages at two ends of the first current load and outputting a first zero-crossing signal when the zero crossing points are detected;

The shunt control circuit is electrically connected with the voltage detection circuit, the first zero-crossing detection circuit and the shunt circuit respectively;

the shunt control circuit is used for controlling the shunt switch circuit to be conducted when the load voltage detected by the voltage detection circuit is 0; when the load voltage detected by the voltage detection circuit is not 0, the shunt switch circuit is controlled to be disconnected; and when the first zero crossing signal is received, controlling the shunt switch circuit to be conducted according to a preset duration.

In one embodiment, the single fire switch circuit comprises:

the input end of the first switching circuit is used for being connected with the power supply voltage, and the output end of the first switching circuit is a first output end of the single-fire switching circuit;

the input end of the second switching circuit is used for being connected with the power supply voltage, and the output end of the second switching circuit is a second output end of the single-fire switching circuit;

the detection end of the second zero-crossing detection circuit is electrically connected with the input end and the output end of the first switch circuit respectively; the second zero-crossing detection circuit is used for detecting zero crossing points of the power supply voltage and outputting a second zero-crossing signal when the zero crossing points are detected;

The single fire control circuit is electrically connected with the controlled end of the first switch circuit, the controlled end of the second switch circuit and the output end of the second zero-crossing detection circuit respectively; the single fire control circuit is used for controlling the first switch circuit to be turned on and controlling the second switch circuit to be turned off when receiving an opening control signal; and when receiving a closing control signal, controlling the first switching circuit to be opened and controlling the second switching circuit to be closed;

the single fire control circuit is also used for controlling the first switch circuit to be disconnected and controlling the second switch circuit to be connected according to the preset duration when receiving the starting control signal and the second zero crossing signal.

In an embodiment, the single fire switch circuit further comprises:

the input end of the first voltage reduction circuit is electrically connected with the output end of the first switch circuit, and the output end of the first voltage reduction circuit is the first output end of the single-fire switch circuit; the first voltage-reducing circuit is used for converting the power supply current into a first current signal and outputting the first current signal.

In an embodiment, the single fire switch circuit further comprises:

The input end of the second voltage reduction circuit is electrically connected with the output end of the second switch circuit, and the output end of the second voltage reduction circuit is the second output end of the single-fire switch circuit;

the second voltage-reducing circuit is used for converting the power supply current into the second current signal and outputting the second current signal.

In an embodiment, the single fire switch circuit further comprises:

the input end of the third voltage reduction circuit is used for being connected with power supply current, and the output end of the third voltage reduction circuit is electrically connected with the single fire control circuit respectively;

the third voltage-reducing circuit is used for converting the power supply current into a third current signal and outputting the third current signal.

In an embodiment, the single fire switch circuit further comprises:

the input end of the current detection circuit is electrically connected with the input end of the first switch circuit, and the output end of the current detection circuit is electrically connected with the single fire control circuit; the current detection circuit is used for detecting the power supply current;

the single fire control circuit is also used for controlling the first switch circuit and the second switch circuit to be disconnected when the current detected by the current detection circuit is larger than a preset current.

In an embodiment, the number of the first current loads is a plurality; the number of the first switch circuits is consistent with the number of the first current loads;

the input ends of the first switch circuits are used for being connected with power supply current, the output ends of the first switch circuits are electrically connected with the first current loads in a one-to-one correspondence mode, and the controlled ends of the first switch circuits are respectively connected with the single-fire control circuit.

In an embodiment, the power supply circuit further comprises a master control circuit;

the main control circuit is electrically connected with the shunt circuit and the single fire switch circuit respectively;

the main control circuit is used for controlling the shunt circuit to be disconnected and controlling the input end of the single fire switch circuit to be connected with the first output end when receiving the starting control signal; when receiving a closing control signal, controlling the shunt circuit to be conducted, and controlling the input end of the single fire switch circuit to be conducted with the second output end;

the main control circuit is also used for detecting zero crossing points of the power supply voltage; the main control circuit is also used for controlling the conduction of the shunt circuit according to the preset duration and controlling the conduction of the input end and the second output end of the single fire switch circuit when the start control signal is received and the zero crossing point of the power supply voltage is detected.

The application also provides an intelligent home system, which comprises:

a first current load;

a second current load;

the power supply circuit described above;

a first output end of a single fire switch circuit of the power supply circuit is electrically connected with the first current load, and a second output end of the single fire switch circuit is electrically connected with the second current load;

the power supply circuit is configured to supply power to the first current load and the second current load.

According to the application, the first current load is short-circuited through the shunt circuit, so that when the single-fire switch circuit provides larger current for the second current load, the circuit in the loop passes through the shunt circuit, and the working state of the first current load is prevented from being influenced. In this way, the power supply circuit of the application can provide larger current power supply regardless of whether the first current load is in an on state or an off state without considering the influence of the current flowing through the first current load.

Drawings

Fig. 1 is a schematic diagram of a power supply circuit according to an embodiment of the application.

Fig. 2 is a schematic diagram of a shunt circuit according to an embodiment of the application.

Fig. 3 is a schematic diagram of a single fire switch circuit according to an embodiment of the application.

Fig. 4 is a schematic diagram of a power supply circuit according to another embodiment of the application.

FIG. 5 is a timing diagram of a single fire switch circuit according to the present application.

Fig. 6 is a schematic structural diagram of an embodiment of the smart home system of the present application.

Description of the main reference signs

First current load 200 of power supply circuit 100

Second current load 300 shunt circuit 110

Single fire switch circuit 120 shunts switch circuit 111

First zero-crossing detection 113 of voltage detection circuit 112

Circuit arrangement

The shunt control circuit 114 includes a first switch circuit 121

Second zero-crossing detection 123 of second switching circuit 122

Circuit arrangement

Single fire control circuit 124 first step-down circuit 125

Second step-down circuit 126 third step-down circuit 127

Current detection circuit 128 master control circuit 130

Third zero crossing detection 131 main control chip 132

Circuit arrangement

The application will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

The following description will make reference to the accompanying drawings to more fully describe the application. Exemplary embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. Like reference numerals designate identical or similar components.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, as used herein, "comprises" and/or "comprising" and/or "having," integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Furthermore, unless the context clearly defines otherwise, terms such as those defined in a general dictionary should be construed to have meanings consistent with their meanings in the relevant art and the present disclosure, and should not be construed as idealized or overly formal meanings.

The following description of exemplary embodiments will be provided with reference to the accompanying drawings. It is noted that the components depicted in the referenced figures are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

Referring to fig. 1 to 6, a power supply circuit 100 is applied to a smart home system, the smart home system includes a first current load 200 and a second current load 300, and a load current of the second current load 300 is greater than a load current of the first current load 200; the power supply circuit 100 includes:

a shunt circuit 110, said shunt circuit 110 being adapted to be connected in parallel with said first current load 200; the shunt circuit 110 is configured to be turned on when the voltage across the first current load 200 is 0;

the shunt circuit 110 is further configured to detect zero crossing points of voltages at two ends of the first current load 200, and conduct the current according to a preset duration when the voltages at two ends of the first current load 200 are not 0 and the zero crossing points of the voltages at two ends of the first current load 200 are detected;

a single fire switch circuit 120, the single fire switch circuit 120 having an input, a first output, and a second output; the input end of the single fire switch circuit 120 is used for accessing a power supply voltage, the first output end of the single fire switch circuit 120 is used for being electrically connected with the first current load 200, and the second output end of the single fire switch circuit 120 is used for being electrically connected with the second current load 300;

The single fire switch circuit 120 is configured to switch on a path between the input terminal and the first output terminal when receiving an on control signal; the path between the input terminal and the first output terminal is disconnected upon receipt of the closing control signal.

The single fire switch circuit 120 is further configured to switch on a path between the input terminal and the second output terminal when receiving an on control signal. When receiving the on control signal, the single fire switch circuit 120 may simultaneously switch on the paths between the input terminal and the first output terminal, and between the input terminal and the second output terminal, so as to supply power to the first current load 200 and the second current load 300 at the same time, so that the first current load and the second current load work normally.

Or, the single fire switch circuit 120 is further configured to detect a zero crossing point of the power supply voltage, and when the turn-on control signal is received and the zero crossing point of the power supply voltage is detected, turn off a path between the input terminal and the first output terminal of the single fire switch circuit 120 and turn on a path between the input terminal and the second output terminal of the single fire switch circuit 120 according to the preset duration. In this manner, by controlling the paths between the input terminal and the first and second output terminals of the single fire switch circuit 120 to be alternately turned on, the first and second current loads 200 and 300 are prevented from affecting each other.

In this embodiment, the input terminal of the single fire switch circuit 120 is used for connecting to the power fire wire. One end of the first current load 200 is connected to the first output end of the single fire switch circuit 120, and the other end is connected to the power zero line. In this way, when the input terminal of the single fire switch circuit 120 is conducted with the first output terminal, power can be supplied to the first current load 200, so that the first current load 200 can operate. The first current load 200 may be an electronic device that needs low current to supply power, such as a lamp, an intelligent curtain, a camera, and the like. In this embodiment, the second current load 300 may be an electronic device requiring high current power supply, such as a control panel, a display device, or the like. For example, the control panel has gateway functions, touch screen, music playing, voice interaction and the like, which are required to work no matter the lamp is turned on or off, and the functions need high current support to work normally.

The single fire switch circuit 120 is also used for communication with a mobile terminal or a control terminal, and receives an on/off control signal. When the single fire switch circuit 120 receives the turn-off control signal, the path between the input terminal and the first output terminal is disconnected to stop the power supply to the first current load 200, so that the first current load 200 is in the off state, and the path between the input terminal and the second output terminal is simultaneously turned on to supply the power to the second current load 300. At this time, the shunt circuit 110 determines that the first current load 200 is in the off state by detecting that the voltage across the first current load 200 is 0, and the shunt circuit 110 is turned on to short-circuit the first current load 200. In this way, when the single fire switch circuit 120 provides a larger current to the second current load 300, the current in the loop passes through the shunt circuit 110 without affecting the first current load 200 (e.g., the lamp will not be slightly bright or flicker in the off state).

When the on control signal is received by the single fire switch circuit 120, the path between the input terminal and the first output terminal is turned on to supply power to the first current load 200, so that the first current load 200 is in an on state, and the path between the input terminal and the second output terminal is turned off to stop supplying power to the second current load 300. At this time, the shunt circuit 110 determines that the first current load 200 is in the on state by detecting that the voltage across the first current load 200 is not 0, and the shunt circuit 110 is turned off so that the current can pass through the first current load 200. In order to realize power supply to the second current load 300 in the on state of the first current load 200, the single fire switch circuit 120 turns off a path between the input terminal and the first output terminal and turns on a path between the input terminal and the second output terminal according to a preset period of time when detecting a zero crossing of the power supply voltage to supply power to the second current load 300. Meanwhile, when the shunt circuit 110 detects the zero crossing point of the voltage at the two ends of the first current load 200, that is, when the power supply voltage crosses the zero point, the shunt circuit 110 is turned on according to a preset time length, so as to short-circuit the first current load 200 within the preset time length, and avoid the influence of the current in the loop flowing through the first current load 200 when the single-fire switch circuit 120 supplies power to the second current load 300. That is, the single fire switch circuit 120 turns off the path between the input terminal and the first output terminal according to a preset period of time in each half of the power supply voltage period, turns on the path between the input terminal and the second output terminal, and turns on the shunt circuit 110 in the half of the power supply voltage period; the single fire switch circuit 120 turns on the path between the input terminal and the first output terminal for the remaining time of each half of the power supply voltage period, turns off the path between the input terminal and the second output terminal, and turns off the shunt circuit 110 for the half of the power supply voltage period, thus circulating. The preset duration may be determined according to actual requirements, for example, may be 15%, 20%, 30%, 35% of the power supply voltage period, and the like, which is not limited herein. It will be appreciated that there is a capacitive device in the first current load 200 that can store energy, and that the capacitive device can supply power to the first current load 200 for a predetermined period of time when the input terminal of the single fire switch circuit 120 is disconnected from the first output terminal. And since the preset duration is generally shorter, the capacitor device will end before the stored energy of the capacitor device is exhausted, so that the working state (such as the brightness of the lamp) of the first current load 200 is not affected.

In an actual application scenario, the setting position of the single fire switch circuit 120 may be far away from the installation position of the first current load 200, that is, the shunt circuit 110 connected in parallel with the first current load 200 is far away from the single fire switch circuit 120, so that the shunt circuit 110 is not convenient to be electrically connected with the single fire tube-opening circuit, so that the single fire switch circuit 120 can communicate with the shunt circuit 110, and the working state of the first current load 200 is output to the shunt circuit 110. Therefore, in the present embodiment, the shunt circuit 110 determines whether the first current load 200 is in the on state or the off state by detecting the voltage across the first current load 200. When the shunt circuit 110 detects that the voltage across the first current load 200 is continuously 0, it indicates that no current passes across the first current load 200, and the first current load 200 is in the off state; when the shunt circuit 110 detects that the voltage across the first current load 200 does not continuously reach 0, it indicates that the current passes across the first current load 200, and the first current load 200 is in the on state. The first current load 200 is powered by the power supply voltage, and the voltage change at two ends of the first current load 200 is the change of the power supply voltage. Therefore, in the case that the shunt circuit 110 and the single fire switch circuit 120 cannot communicate, the present embodiment detects the zero crossing point of the voltage at the two ends of the first current load 200 through the shunt circuit 110 and the zero crossing point of the power supply voltage through the single fire switch circuit 120, so that the shunt circuit 110 and the single fire switch circuit 120 are matched with each other to be accurately switched with each zero crossing point as a reference.

In the application, the first current load 200 is shorted by the shunt circuit 110, so that when the single fire switch circuit 120 provides larger current to the second current load 300, the circuits in the loop pass through the shunt circuit 110, thereby avoiding affecting the working state of the first current load 200. As such, the power supply circuit 100 of the present application can provide a larger current supply regardless of whether the first current load 200 is in an on state or an off state, regardless of the influence of the current flowing through the first current load 200.

Referring to fig. 2, in one embodiment, the shunt circuit 110 includes:

a shunt switch circuit 111, said shunt switch circuit 111 being adapted to be connected in parallel with said first current load 200;

a voltage detection circuit 112, the voltage detection circuit 112 being configured to be connected in parallel with the first current load 200; the voltage detection circuit 112 is configured to detect a voltage across the first current load 200;

a first zero-crossing detection circuit 113, the first zero-crossing detection circuit 113 being connected in parallel with the voltage detection circuit 112; the first zero-crossing detection circuit 113 is configured to detect a zero crossing point of a voltage across the first current load 200, and output a first zero-crossing signal when the zero crossing point is detected;

A shunt control circuit 114, wherein the shunt control circuit 114 is electrically connected to the voltage detection circuit 112, the first zero-crossing detection circuit 113, and the shunt circuit 110, respectively;

the shunt control circuit 114 is configured to control the shunt switch circuit 111 to be turned on when the load voltage detected by the voltage detection circuit 112 is equal to 0; when the load voltage detected by the voltage detection circuit 112 is not equal to 0, the shunt switch circuit 111 is controlled to be turned off; and controlling the shunt switch circuit 111 to be conducted according to a preset duration when the first zero crossing signal is received.

In the present embodiment, the shunt control circuit 114 determines that the first current load 200 is in the on/off state by detecting the voltage across the first current load 200 by the voltage detection circuit 112. When the voltage detection circuit 112 detects that the voltage across the first current load 200 is continuously 0, it indicates that no current passes across the first current load 200, and the first current load 200 is in the off state; when the voltage detection circuit 112 detects that the voltage across the first current load 200 is not 0, it indicates that the current passes across the first current load 200, and the first current load 200 is in the on state. The voltage detection circuit 112 may be implemented by using a voltage dividing resistor. The shunt control circuit 114 is implemented by a microprocessor, FPGA chip, or the like.

When the first current load 200 is in the off state, the single fire switch circuit 120 outputs a large current through the second output terminal. The shunt control circuit 114 controls the shunt switch circuit 111 to be turned on, and short-circuits the first current load 200, so that the current in the loop flows through the shunt switch circuit 111, thereby avoiding the influence of the current in the loop on the first current load 200, and realizing the large-current power taking of the first current load 200 in the off state.

When the first current load 200 is in the on state, the shunt control circuit 114 detects a zero crossing point of the voltage across the first current load 200 through the first zero crossing detection circuit 113. When the zero crossing is detected, the shunt control circuit 114 controls the shunt switch circuit 111 to be turned on according to a preset time period so as to short-circuit the first current load 200, and prevent the current in the loop from passing through the first current load 200 when the single fire switch circuit 120 supplies power to the second current load 300. After the preset period of time has elapsed, the shunt control circuitry 114 controls the shunt switch circuitry 111 to open so that current may be supplied to it through the first current load 200. In this way, the current dividing control circuit 114 uses each zero crossing point as a reference, and is matched with the single fire switch circuit 120 to accurately switch, so as to realize high-current power taking when the first current load 200 is in an on state. The shunt switch circuit 111 may be implemented by using a switching device such as a relay, a MOS transistor, or a triode.

Referring to fig. 3, in one embodiment, the single fire switch circuit 120 includes:

the input end of the first switch circuit 121 is used for accessing a power supply voltage, and the output end of the first switch circuit 121 is a first output end of the single fire switch circuit 120;

the input end of the second switch circuit 122 is used for accessing a power supply voltage, and the output end of the second switch circuit 122 is the second output end of the single fire switch circuit 120;

a second zero-crossing detection circuit 123, wherein a detection end of the second zero-crossing detection circuit 123 is electrically connected with an input end and an output end of the first switch circuit 121 respectively; the second zero-crossing detection circuit 123 is configured to detect a zero crossing point of the power supply voltage, and output a second zero-crossing signal when the zero crossing point is detected;

a single fire control circuit 124, wherein the single fire control circuit 124 is electrically connected with the controlled end of the first switch circuit 121, the controlled end of the second switch circuit 122 and the output end of the second zero crossing detection circuit 123; the single fire control circuit 124 is configured to control the first switch circuit 121 to be turned on and the second switch circuit 122 to be turned off when receiving an on control signal; and, upon receiving a closing control signal, controls the first switching circuit 121 to be turned off and controls the second switching circuit 122 to be turned on;

The single fire control circuit 124 is further configured to control the first switch circuit 121 to be turned off and the second switch circuit 122 to be turned on according to the preset duration when receiving the on control signal and the second zero crossing signal.

In this embodiment, the single fire control circuit 124 controls the first switch circuit to be turned off when receiving the turn-off control signal, and stops supplying power to the first current load 200 to be in the turned-off state. Meanwhile, the second switch circuit 122 is controlled to be turned on to provide current to the second current load 300, so as to realize heavy current power taking of the first current load 200 in the off state. The single fire control circuit 124 may control the on/off of the first switch circuit 121 by receiving an on/off control signal of the mobile terminal or the control terminal, and the first switch circuit 121 may be a push switch, a knob switch, a touch switch, etc. that can be triggered by a user, and the user controls the on/off of the first switch circuit 121 by triggering the first switch circuit. The first switch circuit 121 may be a single fire switch. The second switching circuit can be a switching device such as a relay, an MOS tube, a triode and the like. The single fire control circuit 124 can be implemented by a microprocessor, an FPGA chip, or the like.

When the single fire control circuit 124 receives the on control signal, it controls the first switch circuit 121 to be turned on, and supplies power to the first current load 200, so that it is in an on state. At the same time, the second switch circuit 122 is controlled to be turned off, so that the operation of the first current load 200 is prevented from being influenced by the large current in the loop. When the first current load 200 is in the on state, the single fire control circuit 124 also detects a zero crossing point of the power supply voltage through the second zero crossing detection circuit 123, and controls the first switching circuit 121 to be turned off according to a preset time period when the zero crossing point is detected, so as to temporarily stop the power supply to the first current load 200, and controls the second switching circuit 122 to be turned on, so as to supply a larger current to the second current load 300. After the preset period of time is over, the single fire control circuit 124 controls the first switch circuit 121 to be turned on, resumes the power supply to the first current load 200, and simultaneously controls the second switch circuit 122 to be turned off. In this way, the single fire control circuit 124 uses each zero crossing point as a reference, and cooperates with the shunt circuit 110 to accurately switch, so as to realize high-current power taking of the first current load 200 in the on state.

In one embodiment, the single fire switch circuit 120 further comprises:

a first step-down circuit 125, wherein an input end of the first step-down circuit 125 is electrically connected to an output end of the first switch circuit 121, and an output end of the first step-down circuit 125 is a first output end of the single fire switch circuit 120; the first step-down circuit 125 is configured to convert the power supply current into a first current signal and output the first current signal.

The present embodiment converts the power supply current output from the first switch circuit 121 into a first current signal through the first voltage-reducing circuit 125 to supply a small current required for its operation to the first current load 200.

In one embodiment, the single fire switch circuit 120 further comprises:

the input end of the second voltage reducing circuit 126 is electrically connected with the output end of the second switch circuit 122, and the output end of the second voltage reducing circuit 126 is the second output end of the single fire switch circuit 120;

the second step-down circuit 126 is configured to convert the power supply current into the second current signal and output the second current signal.

The present embodiment converts the power supply current output from the second switch circuit 122 into a second current signal through the second voltage-reducing circuit 126 to supply a large current required for the operation thereof to the second current load 300.

In one embodiment, the single fire switch circuit 120 further comprises:

the input end of the third voltage reducing circuit 127 is used for accessing power supply current, and the output end of the third voltage reducing circuit 127 is electrically connected with the single fire control circuit 124 respectively;

the third step-down circuit 127 is configured to convert the power supply current into a third current signal and output the third current signal.

The present embodiment converts the power supply current into a third current signal through the third voltage-reducing circuit 127 to supply the current required for its operation to the single fire control circuit 124.

In one embodiment, the single fire switch circuit 120 further comprises:

a current detection circuit 128, wherein an input end of the current detection circuit 128 is electrically connected with an input end of the first switch circuit 121, and an output end of the current detection circuit 128 is electrically connected with the single fire control circuit 124; the current detection circuit 128 is used for detecting the power supply current;

the single fire control circuit 124 is further configured to control the first switch circuit 121 and the second switch circuit 122 to be turned off when the current detected by the current detection circuit 128 is greater than a preset current.

In this embodiment, the current detection circuit 128 detects the power supply current, and when the power supply current is greater than the preset current, the single fire control circuit 124 controls the first switch circuit 121 and the second switch circuit 122 to be turned off in time, so as to avoid damaging the first current load 200, the first current load 200 and other circuit devices due to excessive power supply current. The current detection circuit 128 may be implemented by using a detection resistor, a current sampling chip, a hall sensor, a current transformer, and the like.

In one embodiment, the number of the first current loads 200 is a plurality; the number of the first switch circuits 121 is identical to the number of the first current loads 200;

the input ends of the first switch circuits 121 are all used for accessing power supply current, the output ends of the first switch circuits 121 are electrically connected with the first current loads 200 in a one-to-one correspondence manner, and the controlled ends of the first switch circuits 121 are respectively connected with the single fire control circuit 124.

In the present embodiment, a plurality of first switch circuits 121 may be provided to control a plurality of first current loads 200, respectively, according to practical applications. The first switch circuit 121 may also employ a relay.

Referring to fig. 4, in an embodiment, the power supply circuit 100 further includes a master circuit 130;

the main control circuit 130 is electrically connected with the shunt circuit 110 and the single fire switch circuit 120 respectively;

the main control circuit 130 is configured to control the shunt circuit 110 to be turned off and control the input terminal of the single fire switch circuit 120 to be turned on with the first output terminal when receiving an on control signal; controlling the shunt circuit 110 to be turned on when receiving the turn-off control signal, and controlling the input terminal of the single fire switch circuit 120 to be turned on with the second output terminal;

The master control circuit 130 is further configured to detect a zero crossing of a power supply voltage; the main control circuit 130 is further configured to control the shunt circuit 110 to be turned on and control the input terminal of the single fire switch circuit 120 to be turned on with the second output terminal according to the preset duration when the start control signal is received and the zero crossing of the power supply voltage is detected.

In this embodiment, the main control circuit 130 communicates with the mobile terminal or the control terminal and receives the on/off control signal. When the master circuit 130 receives the off control signal, the control single fire switch circuit 120 opens the path between the input terminal and the first output terminal, and opens the path between the input terminal and the second output terminal, to stop the supply of power to the first current load 200, to put it in an off state, and to supply power to the second current load 300. Meanwhile, the main control circuit 130 controls the shunt circuit 110 to be turned on, and shorts the first current load 200. In this way, when the single fire switch circuit 120 provides a larger current to the second current load 300, the current in the loop passes through the shunt circuit 110 without affecting the first current load 200 (e.g., the lamp will not be slightly bright or flicker in the off state).

When the main control circuit 130 receives the on control signal, the control single fire switch circuit 120 turns on the path between the input terminal and the first output terminal, and turns off the path between the input terminal and the second output terminal, to supply power to the first current load 200, to be in an on state, and to stop supplying power to the second current load 300. At the same time, the shunt circuit 110 is controlled to be turned off so that current can pass from the first current load 200. In order to supply power to the second current load 300 when the first current load 200 is in the on state, the main control circuit 130 controls the single fire switch circuit 120 to disconnect the path between the input terminal and the first output terminal and to connect the path between the input terminal and the second output terminal according to a preset period of time when detecting the zero crossing point of the power supply voltage. Meanwhile, the shunt circuit 110 is controlled to be turned on according to a preset time period, so as to short-circuit the first current load 200 within the preset time period, and avoid the influence of the current in the loop flowing through the first current load 200 when the single-fire switch circuit 120 supplies power to the second current load 300. That is, the main control circuit 130 controls the single fire switch circuit 120 to disconnect the path between the input terminal and the first output terminal for a preset period of time in each half of the power supply voltage period, to conduct the path between the input terminal and the second output terminal, and to control the shunt circuit 110 to conduct in the half of the power supply voltage period; and controlling the single fire switch circuit 120 to turn on the path between the input terminal and the first output terminal for the remaining time of each half of the power supply voltage period, to turn off the path between the input terminal and the second output terminal, and to control the shunt circuit 110 to turn off for the half of the power supply voltage period, thus cycling. The preset duration may be determined according to actual requirements, for example, may be 15%, 20%, 30%, 35% of the power supply voltage period, and the like, which is not limited herein. It will be appreciated that there is a capacitive device in the first current load 200 that can store energy, and that the capacitive device can supply power to the first current load 200 for a predetermined period of time when the input terminal of the single fire switch circuit 120 is disconnected from the first output terminal. And since the preset duration is generally shorter, the capacitor device will end before the stored energy of the capacitor device is exhausted, so that the working state (such as the brightness of the lamp) of the first current load 200 is not affected.

In this embodiment, the main control circuit 130 controls the single fire switch circuit 120 and the shunt circuit 110 respectively, so as to supply power to the second current load 300 and the first current load 200 respectively. The single fire switch circuit 120 and the shunt circuit 110 are both switched simultaneously under the control of the main control circuit 130 with reference to each zero crossing point detected by the main control circuit 130. In this manner, the single fire switch circuit 120 can provide a larger current supply regardless of whether the first current load 200 is in an on state or an off state, regardless of the effect of the current flowing through the first current load 200.

In one embodiment, the master circuit 130 includes:

a third zero-crossing detection circuit 131, wherein a detection end of the third zero-crossing detection circuit 131 is electrically connected with the single fire switch circuit 120; the third zero-crossing detection circuit 131 is configured to detect a zero crossing point of the power supply voltage, and output a third zero-crossing signal when the zero crossing point is detected;

the main control chip 132, the main control chip 132 is electrically connected with the shunt circuit 110, the single fire switch circuit 120 and the third zero crossing detection circuit 131 respectively;

the main control chip 132 is configured to control the shunt circuit 110 to be turned off and control the input terminal of the single fire switch circuit 120 to be turned on with the first output terminal when receiving the on control signal; controlling the shunt circuit 110 to be turned on when receiving the turn-off control signal, and controlling the input terminal of the single fire switch circuit 120 to be turned on with the second output terminal;

The main control circuit 130 is further configured to control the shunt circuit 110 to be turned on and control the input terminal of the single fire switch circuit 120 to be turned on with the second output terminal according to the preset duration when receiving the on control signal and the third zero crossing signal.

In this embodiment, the main control chip 132 may be a microprocessor, an FPGA (programmable logic array) chip, or the like. The main control circuit 130 detects zero crossing points of the power supply voltage through the third zero crossing detection circuit 131 to control the single fire switch circuit 120 and the shunt circuit 110 to switch on states at the same time at each zero crossing point, so that the power supply of the second current load 300 is realized, and the power supply of the first current load 200 is not influenced.

Referring to fig. 6, the present application also provides an intelligent home system, including:

a first current load 200;

a second current load 300;

the power supply circuit 100 described above;

a first output end of the single fire switch circuit 120 of the power supply circuit 100 is electrically connected with the first current load 200, and a second output end of the single fire switch circuit 120 is electrically connected with the second current load 300;

the power supply circuit 100 is configured to supply power to the first current load 200 and the second current load 300.

The detailed structure of the power supply circuit 100 can refer to the above embodiments, and will not be described herein; it can be understood that, because the power supply circuit 100 is used in the smart home system of the present application, the embodiments of the smart home system of the present application include all the technical schemes of all the embodiments of the power supply circuit 100, and the achieved technical effects are identical, and are not described in detail herein.

Hereinabove, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those of ordinary skill in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the application without departing from the spirit and scope thereof. Such modifications and substitutions are intended to be included within the scope of the present application.

Claims

1. A power supply circuit applied to an intelligent home system, wherein the intelligent home system comprises a first current load and a second current load, and the load current of the second current load is larger than that of the first current load; the power supply circuit is characterized by comprising:

a shunt circuit for connection in parallel with the first current load; the shunt circuit is used for being conducted when the voltage across the first current load is 0;

The shunt circuit is also used for detecting zero crossing points of voltages at two ends of the first current load, and conducting the shunt circuit according to preset time length when the voltages at two ends of the first current load are not 0 and the zero crossing points of the voltages at two ends of the first current load are detected;

the single fire switch circuit is used for switching on a passage between the input end and the first output end when receiving an opening control signal; disconnecting a path between the input terminal and the first output terminal upon receipt of a closing control signal;

the single fire switch circuit is also used for switching on a passage between the input end and the second output end when receiving an opening control signal;

or the single fire switch circuit is further used for detecting the zero crossing point of the power supply voltage, and when the starting control signal is received and the zero crossing point of the power supply voltage is detected, switching off the passage between the input end and the first output end and switching on the passage between the input end and the second output end according to the preset duration.

2. The power supply circuit of claim 1, wherein the shunt circuit comprises:

a shunt switch circuit for connecting in parallel with the first current load;

3. The power supply circuit of claim 2, wherein the single fire switch circuit comprises:

4. The power supply circuit of claim 3, wherein the single fire switch circuit further comprises:

5. The power supply circuit of claim 3, wherein the single fire switch circuit further comprises:

the second voltage-reducing circuit is used for converting the power supply current into a second current signal and outputting the second current signal.

6. The power supply circuit of claim 3, wherein the single fire switch circuit further comprises:

7. The power supply circuit of claim 3, wherein the single fire switch circuit further comprises:

8. The power supply circuit of claim 3, wherein the number of first current loads is a plurality, the number of first switch circuits being consistent with the number of first current loads;

9. The power supply circuit of claim 1, wherein the power supply circuit further comprises a master circuit;

10. An intelligent home system, the intelligent home system comprising:

a first current load;

a second current load;

the power supply circuit according to any one of claims 1 to 9;